Chuck-removing device.



A. W; SOHRAMM. 05001: REMOVING DEVICE.

APPLIUATION FILED JULY 10. 1909. 972,575;

Patented Oct. 11, 1910.

2 SHBETBSHEET 1.

59- 7 65 UNI? C A. W. SOHRAMM. CHUCK REMOVING DEVIUE. APPLIUATION FILED JULY 10. 1909.

Patented Oct. 11, 1910.

2 SHEETS-SHEET 2.

f] I. "52 \nnnngjnmg Z I [f ran FHCE.

CHUCK-REMOVING DEVICE.

To all whom it may concern:

Be it known that I, AnoLrH W. SGHRAMM, a citizen of the United States, residing in Riverton, New Jersey, have invented certain Improvements in Chuck-Removing Devices, of which the following is a specification.

One object of my invention is to provide a device particularly applicable to machine tools, for the purpose of conveniently and quickly loosening or removing from a shaft, a tool and particularly a chuck carried thereby.

It is further desired to provide a tool removing device of a relatively simple and compact construction, which shall be certain, powerful and rapid in operation.

These objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying drawings, in which Figures 1 and 2 are respectively a side and an end elevation of one form of the device constituting my invention; Fig. 8, is a plan, partly in horizontal section, further illustrating my invention; Figs. 4, 5, 6 and 7, are perspective views of certain of the detail parts of the device; Fig. 8, is a side elevation of one of the shoes, Figs. 9 and 10, are two views illustrating the construction of the helical grooves in one of the parts of the device shown in Figs. 1 and 2; Figs. 11 and 12, are vertical sections of modified forms of my invention; Fig. 13,is an end elevation of the device shown in Fig. 11; and Figs. 14 and 15 are perspective views of certain detail parts of the devices shown in Figs. 11 and 12 respectively.

Heretofore much trouble has been experienced in removing various forms of tools, and particularly chucks, from the ends of tapered shafts or spindles, especially those found in motors of the type employed by dentists for driving lathes, polishing tools, etc.

While my device is primarily designed for application to this type of apparatus, it is to be understood that it is equally available for the removal or loosening of any structure mounted upon or within a tapering or other form of shaft.

In Figs. 1, 2, 3, 11, 12 and 13, of the above drawings, A represents a shaft, to the tapered portion a, of which a chuck or tool K may be applied, and B is a sleeve or Specification of Letters Patent.

Application filed July 10, 1909.

Patented Oct. 11, 1910.

Serial No. 506,905.

bushing forming part of the bearing or other fixed structure adjacent to or supporting said shaft.

As shown in Figs. 4, 9 and 10, the outer end of this sleeve is provided with two helical grooves b forming cam surfaces and has mounted upon the end portion in which said grooves are formed, a head C, shown in Fig. 3. Said head is provided, preferably at nearly opposite points, with two cylindrical openings 0, Fig. 7 in which are journaled the cylindrical portions (Z of a pair of trunnions D. Each of these trunnions has its outer end (2, Fig. 5, made in a substantially cubical form, while its inner end (l is cylindrical and projects eccentrically from the inner face of the portion d, so as to extend into one of the grooves b. In each of said grooves is a shoe E, Fig. 6, having a cylindrical hole for the reception of the eccentrically placed inner end d of one of the trunnions.

A Y-shaped yoke F, Fig. 2, has in each of its arms a rectangular recess for the reception of the cubical end 03 of one of the trunnions D and these parts are held together by screws 7 which pass through each fork and the trunnion mounted therein.

Under operating conditions difierent chucks or other tools are mounted on the tapered portion a of the shaft A, so that, as will be understood by those skilled in the art, the inner faces of such tools will be at varying distances from the end or face of the head C, depending upon the fit and size of the tapered portion of said tools. As in most instances the taper is relatively gradual, it is found to be exceedingly difficult to loosen or remove a tool from the shaft. For the purpose of quickly bringing the head G into engagement with said different chucks, an operator takes hold of the depending stem 7 of the yoke F, and rotates it with the cap C about the shaft A as an axis. Owing to the fact that the shoes E, which are connected to the trunnions, are necessarily forced to slide in the helical grooves I), this revolution of the yoke causes the cap to be moved outwardly until its face comes into engagement with the adjacent face or end of the tool or other object on the shaft. The handle of the yoke then moved outwardly into the position shown in dotted lines in Fig. 1, which causes a partial revolution of each of the trunnions in their bearings, and since the projecting ends (Z of said trunnions are so placed that these act as fulcrums, the head is moved outwardly with a force depending upon the ratio of the length of the arm 7 of the yoke F, to the distance between the center lines of the parts (Z and (Z of the trunnions.

Since a relatively great leverage is attainable by this construction, even the most tightly mounted tool is forced ofi of the tapered end a, after which the release of the arm f of the yoke F permits this latter under the action of gravity to return to its normal depending position.

In that form of my invention shown in Figs. 11, 13 and 14, I mount a collar H upon the outer end of the sleeve or bushing B, or what is the same thing, upon an internally flanged sleeve 6 screwed thereon and confining a spring 6 between its inner edge and an internally projecting flange on said collar. Said spring is so designed as to maintain the collar in engagement with the adjacent end of the motor casing or other bearing structure A, and it is to be noted that the adjacent faces of the collar and of said structure are provided with one or more teeth, such as it, having an inclined approach or approaches. Opposite sides of the collar 7 are provided with inclined grooves of which one is shown at h, and in these slides a wedge shaped operating lever or handle J, the arrangement being such that the face of said handle adjacent to a chuck K on the shaft A, is parallel with the end of said chuck. lVith this arrangement of parts, when it is desired to forcibly remove a chuck from the shaft, the handle or lever J is moved in a line at an angle to the shaft A, and owing to its wedge shape it quickly engages the adjacent end of the chuck. By means of the hand hold 7' it and hence the collar H, are now rotated about the shaft A as an axis. Owing, however, to the toothed or inclined faces of the collar and of the adjacent portion of the bearing A, the collar and with it the operating handle or lever J, are forced outwardly, thereby moving the chuck longitudinally on the shaft and loosening it as desired. After such removal of the chuck, the lever J is returned to its normal vertical position and permitted to slide in the grooves of the collar H to its position of rest, illustrated in Figs. 11 and 13.

Still another modification of the invention is illustrated in Fig. 12, where as before, a threaded sleeve 6 is screwed on to the end of the bushing B, and a spring .7) is similarly confined between said sleeve and an internal flange of a collar H. This collar has an operating handle or arm 72, and its inner face is provided with any suitable number of teeth designed to co-act with similarly designed teeth Z on a second collar L, mounted between it and the adjacent face of the hearing A. Said second collar, however, has its opposite face also provided with teeth Z, which in turn are designed to cooperate with similarly formed teeth on said bearing; it being noted, however, that this second setof teeth are of less pitch and project but a relatively small amount beyond a plane at right angles to the shaft A. Between the collar L and the bushing B, I mount a spring 6 whose ends are'respect-ively attached to said parts so as to at all times tend to turn the collar to and maintain it in a position in which its teeth are in mesh with the teeth on the bearing A, with the least amount of separation of said parts. In order to remove a chuck K, the collar H is rotated about the shaft A by force applied to the handle or arm if, and as a result, its face is quickly brought into engagement with said chuck by reason of the co-action of its teeth with the teeth Z of the collar L. As soon, however, as such engagement has taken place, the two collars immediately become jammed together and the collar L is car ried around with the collar H. these conditions, the teeth Z co-actwith the teeth on the bearing A, which as before noted are of smaller pitch, so that as a result, a relatively great force is made available for use in pressing said chuck off of the shaft A. As soon as the chuck has been removed, the collar H,by means of the handle 72?, (which may project in any desired direction though preferably depending) is brought to its normal position, and the spring If serves to automatically return the second collar L to its position of rest. In this last form of my invention it will be seen that the act of removing the chuck is accomplished by a continuous movement of rotation of the operating handle about the shaft, while in the second form, shown in Fig. 11, the same end is accomplished by a transverse movement of the lever J followed by a movement of rotation about the shaft. ln the first form the operation requires that the operating lever F be first rotated about the shaft and then moved in a plane including the shaft. In any case, however, either the 1 bushing B or the bearing structure A serves as an abutment and it is between this and the chuck that the various pressure exerting devices described are mounted and constructed to act.

I claim:

1. The combination of a shaft and an abutment fixed against longitudinal movement relatively thereto; a tool mounted on the shaft; a movable member placed to cooperate with the tool and with the abutment; means cooperatively arranged with said member for effecting a relatively rapid extension thereof between the tool and the abutment; and other means also cooperat- Under ing with said member for subsequently effecting a relatively slower and more powerful adjustment between the same elements.

2. The combination of a shaft and an abutment fixed against longitudinal move ment relatively thereto; a tool mounted on the shaft; a movable member placed to cooperate with the tool and with the abutment; means cooperatively arranged with said member for effecting a relatively rapid extension thereof between the tool and the abutment; and other means also cooperating with said member for subsequently effecting a relatively slower and more powerful adjustment between the same elements; the material of the movable member being disposed to automatically return the same to its normal position after it has been moved therefrom.

3. The combination of a shaft for the reception of a tool; an abutment fixed from movement longitudinally of said shaft; a member revoluble about the shaft between the abutment and the tool and formed to be capable of extension relatively to said abutment to engage it and the tool; with means for exerting on said member a force greater than that required for its extension, to move the tool on the shaft after it has engaged the same.

4. The combination of a shaft for the support of a tool; an abutment fixed from movement longitudinally of said shaft; a member mounted to be rotatable about the shaft between the tool and the abutment and also movable in a plane including said shaft; with means for causing such movements of the member to move the tool longitudinally of the shaft.

5. The combination of a shaft for the reception of a tool; an abutment fixed against longitudinal movement relatively to the shaft; a lever having trunnions provided with eccentric portions and operative on the abutment; with a member operatively connected to said lever and capable of being moved thereby into engagement with a tool on the shaft.

6. The combination of a tubular abutment; a shaft passing through the same and fixed from longitudinal movement relatively thereto; a cap for the abutment; a forked lever; and trunnions for the lever mounted to be operative on the abutment and cooperating therewith to cause movement of the cap longitudinally of the shaft when the lever is operated.

7. The combination with a shaft of an abutment fixed against longitudinal movement relatively thereto and provided with a helical groove; a member movable longitudinally of the shaft; a lever engaging said member; with fulcrum pieces for the lever mounted in the groove of the abutment and engaged by said lever.

8. The combination of a shaft, an abutment, a lever, and means for connecting the lever and the abutment, the same including projections on one of said members extending into inclined grooves in the other memher, said projections having eccentric portions, and the lever being movable in a plane including said shaft.

9. The combination of a shaft for a tool to be driven, an abutment having inclined grooves, a member having bearings, trunnions fitting said bearings and having eccentric portions entering said grooves, with a lever operatively connected to the trunnions.

10. The combination of an abutment having inclined grooves, a shaft for a tool to be driven, a member capable of moving into engagement with the tool on the shaft, a lever having trunnions movably mounted on said member and provided with eccentric portions, with shoes mounted in the grooves of said abutment and engaged by the eccentric portions of said trunnions.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ADOLPH W. SCHRAMM.

Witnesses:

WILLIAM E. BRADLEY, WM. A. BARR. 

